Improvement in turning-lathes



wfLLiAM SELLERS.

improvemet in Turning-Lathes.' N0. 127,929. Patented.JungV11v,1872.

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IMPROVEMENT IN TURNING-LATHES.

Specification forming part of Letters Patent No. 127,929, dated June 11,1872.

To all whom it may concern:

Be it known that I, WILLIAM SELLERS, of the city and county ofPhiladelphia, in the State of Pennsylvania, have invented certain newand useful Improvements in Turning- Lathes, of which the following is aspecification:

Letters Patent of the United States were granted to me December 28,1869, No. 98,423, for an improved lathe, in which the bearingsurfaces ofthe adjustable or sliding head and its clamping piece are so arrangedthat the clamping pressure in addition to holding the head down securelyon the surface of the shear or bed draws it over sidewise against theinner vertical edge of one side of the shear. t

On the 23d of February, 1871, I filed an application for an improvementupon the device patented as aforesaid, which improvement had for itsobject the provision lof a lateral adjustment of the sliding oradjustable head within certain limits. In that application theadjustable or sliding head rested directly upon the surface of the shearor bed. The slide-rest in all such lathes is provided With guides orways, which rest upon the shear or bed and slide freely thereon, beingheld in place by the angled sides or edges of the bed, as is Wellunderstood, and then ways or guides pass on either side of theadjustable or sliding head, respectively, so that the lateral adjustmentof the sliding head is limited by the guides-or ways of the slide-rest.

Now, the object of my present improvement is to enlarge the limits oflateral adjustment, as provided for in the aforesaid application; andthe nature of my present improvement consists in providing a base forthe adjustable head of suicient thickness to raise the bottom of thishead above the top of the guides or ways on the slide-rest; and inproviding this base with a clamping arrangement operating substantiallyas described in my patent dated December 28,1869,No. 98,423; and also inproviding this base with a guiding-bar and adjusting-screws, constructedand operating substantially as described in my applica tion filed the23d of February, 1871.

In order that my said improvement may be more clearly understood,reference may be made to the drawing accompanying this specificationforming part thereof, in which= Figure lis an end elevation of theadjustable head. Fig. 2 is a side view of the same. Fig. et is asectional plan 'of the adjustable head through the adjusting-screws.Fig. 3 is a plan of the base-piece under the adjustable head. Fig. 5 isa vertical section of the adjustable head and base through theholdingdown bolts.

In the application led 23d of February, 1871, the intermediate plate D,with its transverse guide-bar H, was placed between'the sides of theshear or bed, the under side of the guide-bar H alone resting on the topof the shear or bed.

In the present application this intermediate plate D is extended overthe top of the shear sufficiently to receive the base of the adjustablehead, and of suflicient thickness to slightly exceed the thickness ofthe guide or way on the slide-rest, the adjustable head iscorrespondingly shortened; the plate D carries the guide-bar H H, asbefore 5 and the holding-down bolts are arranged in the same manner; theeffect being that when the holdingdown bolt or bolts are tightened theplate D will be pinched between the adjustable head A and the shear orbed in addition to being drawn over laterally, as described in theapplication of February 23d, 1871. The baseplate D'being thicker thanthe slide-rest permits the lateral adjustment of the head over theslide-rest, and this adjustment is thus limited only by the lugs makingthe nuts for the adjusting-screws, and by the slots through which theholding-down bolts pass.

The invention which is the subject of this patent is an improvement onthe machines described in my patent No. 98,423, granted December 28,1869, and the application filed February 23, 1871, and as suchimprovement I claim- The elevated block D, extending above andinterposed between the shears and the base of the lathe-head, as and forthe purpose specified.

In testimony whereof I have hereunto subscribed my name.

. WM. SELLERS.

Witnesses:

JOE I. PEYToN, EDWD. C. DAVIDSON.

